pinctrl-sunxi.zip_allwinner资源-CSDN文库

共2个文件

h：1个

c：1个

版权申诉

64 浏览量 2022-09-24 19:18:38 上传评论收藏 12KB ZIP 举报

《Allwinner SoC平台的引脚控制器：pinctrl-sunxi详解》在嵌入式系统和物联网设备中，SoC（System on Chip）扮演着核心角色，Allwinner是一家知名的SoC制造商，其产品广泛应用于平板电脑、智能电视盒等设备。在Allwinner的SoC平台上，引脚控制器（Pin Controller）是实现硬件资源复用和配置的关键组件。本文将深入探讨“pinctrl-sunxi”驱动，它是针对Allwinner SoC的引脚控制器设计，用于管理和配置板级引脚功能。引脚控制器是嵌入式系统中不可或缺的部分，它的主要任务是对SoC上的GPIO（General Purpose Input/Output）引脚进行配置，使其能够适应不同的外设接口需求。在Allwinner的SunXi系列SoC中，pinctrl-sunxi驱动程序实现了这一功能，为开发者提供了灵活的引脚配置手段。 pinctrl-sunxi.c是驱动的核心实现文件，它包含了对引脚控制器的初始化、配置和管理函数。在该文件中，可以找到如pinmux（引脚复用）和pinconfig（引脚配置）的相关操作，这些操作是通过与硬件寄存器交互来完成的。例如，pinmux允许一个引脚在多种功能之间切换，以满足不同外设的需求；而pinconfig则用于设置引脚的工作模式，如输入/输出、上下拉、开漏等特性。 pinctrl-sunxi.h是头文件，定义了相关的数据结构、枚举类型和接口函数。在这里，可以看到如struct sunxi_pinctrl、struct sunxi_gpiochip等结构体，它们分别代表了引脚控制器实例和GPIO芯片的信息。同时，还有一些关键的API，如sunxi_pinctrl_request、sunxi_pinctrl_free、sunxi_pinctrl_config等功能函数，用于请求、释放引脚以及设置引脚的配置。在Linux内核中，pinctrl子系统提供了一种统一的方式来管理各个SoC的引脚控制器。通过pinctrl接口，驱动程序可以透明地请求和配置引脚，无需关心具体的硬件细节。pinctrl-sunxi驱动是这个子系统的一部分，它实现了与Allwinner SoC硬件匹配的抽象层，使得开发者能够方便地进行系统级的引脚管理。在实际应用中，例如在开发基于Allwinner SoC的开发板时，pinctrl-sunxi驱动的使用是至关重要的。通过调用内核提供的API，开发者可以控制板级的GPIO引脚，以连接各种外设，如LCD显示屏、USB接口、UART通信等。同时，由于驱动程序对硬件进行了详细的抽象，这使得在不同的Allwinner SoC型号间移植代码变得更为容易。 “pinctrl-sunxi”驱动为Allwinner SoC的引脚控制器提供了一个高效、灵活的软件接口，简化了开发过程，提高了系统的可扩展性和兼容性。无论是对硬件开发者还是软件工程师，理解并熟练运用这一驱动都是在Allwinner平台进行系统设计和优化的必备技能。

资源推荐

资源详情

资源评论

收起资源包目录

pinctrl-sunxi.zip （2个子文件）

pinctrl-sunxi.c 65KB

pinctrl-sunxi.h 22KB

/* * Allwinner A1X SoCs pinctrl driver. * * Copyright (C) 2012 Maxime Ripard * * Maxime Ripard <maxime.ripard@free-electrons.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/io.h> #include <linux/clk.h> #include <linux/gpio.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/pinctrl/consumer.h> #include <linux/pinctrl/machine.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinconf-generic.h> #include <linux/pinctrl/pinmux.h> #include <linux/platform_device.h> #include <linux/slab.h> #include "core.h" #include "pinctrl-sunxi.h" static const struct sunxi_desc_pin sun4i_a10_pins[] = { SUNXI_PIN(SUNXI_PINCTRL_PIN_PA0, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXD3 */ SUNXI_FUNCTION(0x3, "spi1"), /* CS0 */ SUNXI_FUNCTION(0x4, "uart2")), /* RTS */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA1, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXD2 */ SUNXI_FUNCTION(0x3, "spi1"), /* CLK */ SUNXI_FUNCTION(0x4, "uart2")), /* CTS */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA2, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXD1 */ SUNXI_FUNCTION(0x3, "spi1"), /* MOSI */ SUNXI_FUNCTION(0x4, "uart2")), /* TX */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA3, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXD0 */ SUNXI_FUNCTION(0x3, "spi1"), /* MISO */ SUNXI_FUNCTION(0x4, "uart2")), /* RX */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA4, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXD3 */ SUNXI_FUNCTION(0x3, "spi1")), /* CS1 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA5, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXD2 */ SUNXI_FUNCTION(0x3, "spi3")), /* CS0 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA6, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXD1 */ SUNXI_FUNCTION(0x3, "spi3")), /* CLK */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA7, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXD0 */ SUNXI_FUNCTION(0x3, "spi3")), /* MOSI */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA8, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXCK */ SUNXI_FUNCTION(0x3, "spi3")), /* MISO */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA9, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXERR */ SUNXI_FUNCTION(0x3, "spi3")), /* CS1 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA10, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ERXDV */ SUNXI_FUNCTION(0x4, "uart1")), /* TX */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA11, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* EMDC */ SUNXI_FUNCTION(0x4, "uart1")), /* RX */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA12, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* EMDIO */ SUNXI_FUNCTION(0x3, "uart6"), /* TX */ SUNXI_FUNCTION(0x4, "uart1")), /* RTS */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA13, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXEN */ SUNXI_FUNCTION(0x3, "uart6"), /* RX */ SUNXI_FUNCTION(0x4, "uart1")), /* CTS */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA14, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXCK */ SUNXI_FUNCTION(0x3, "uart7"), /* TX */ SUNXI_FUNCTION(0x4, "uart1")), /* DTR */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA15, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ECRS */ SUNXI_FUNCTION(0x3, "uart7"), /* RX */ SUNXI_FUNCTION(0x4, "uart1")), /* DSR */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA16, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ECOL */ SUNXI_FUNCTION(0x3, "can"), /* TX */ SUNXI_FUNCTION(0x4, "uart1")), /* DCD */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PA17, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "emac"), /* ETXERR */ SUNXI_FUNCTION(0x3, "can"), /* RX */ SUNXI_FUNCTION(0x4, "uart1")), /* RING */ /* Hole */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB0, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2c0")), /* SCK */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB1, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2c0")), /* SDA */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB2, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "pwm")), /* PWM0 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB3, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "ir0")), /* TX */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB4, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "ir0")), /* RX */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB5, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s"), /* MCLK */ SUNXI_FUNCTION(0x3, "ac97")), /* MCLK */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB6, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s"), /* BCLK */ SUNXI_FUNCTION(0x3, "ac97")), /* BCLK */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB7, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s"), /* LRCK */ SUNXI_FUNCTION(0x3, "ac97")), /* SYNC */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB8, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s"), /* DO0 */ SUNXI_FUNCTION(0x3, "ac97")), /* DO */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB9, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s")), /* DO1 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB10, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s")), /* DO2 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB11, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s")), /* DO3 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB12, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2s"), /* DI */ SUNXI_FUNCTION(0x3, "ac97")), /* DI */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB13, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "spi2")), /* CS1 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB14, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "spi2"), /* CS0 */ SUNXI_FUNCTION(0x3, "jtag")), /* MS0 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB15, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "spi2"), /* CLK */ SUNXI_FUNCTION(0x3, "jtag")), /* CK0 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB16, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "spi2"), /* MOSI */ SUNXI_FUNCTION(0x3, "jtag")), /* DO0 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB17, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "spi2"), /* MISO */ SUNXI_FUNCTION(0x3, "jtag")), /* DI0 */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB18, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "i2c1")), /* SCK */ SUNXI_PIN(SUNXI_PINCTRL_PIN_PB19, SUNXI_FUNCTION(0x0, "gpio_in"), SUNXI_FUNCTION(0x1, "gpio_out"), SUNXI_FUNCTION(0x2, "

评论收藏

内容反馈

版权申诉